Initializing 3D field…

Diffusion Sim

Media → yolk sac → embryo transport. Click the dish to inject a spike · drag to orbit · scroll to zoom.

Reachest = 0 s

Place a spike to begin

Media

Yolk sac

Embryo proper

Embryo / media0%

Peak conc.0.00

Mass distribution

Embryo membrane · size gate

Yolk-sac membrane

Dish edge

lowconcentrationhigh

Reachest = 0 s

Place a spike to begin

Media

Yolk sac

Embryo proper

Embryo / media0%

Peak conc.0.00

Mass distribution

Nutrient / molecule

Glucose

Primary energy substrate for the growing embryo.

MW

180 Da

D

600µm²/s

radius

0.36nm

Simulation

Speed≈ 167 sim-s / s

Height exaggeration1.00×

Membrane selectivity

Each membrane passes molecules below its molecular-weight cut-off and blocks larger ones. The embryo gate is the stricter of the two — the reason large proteins fill the yolk sac yet never reach the embryo.

A teaching model: diffusion coefficients and cut-offs are literature-scale approximations, not calibrated to a specific species. Time is real biological time, sped up.